Stock Option and Stock Award Plans (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Mar. 03, 2018	Mar. 04, 2017	Feb. 27, 2016
Stock options and stock award Plans
Stock-based compensation costs	$ 25,793	$ 23,482	$ 37,948
Shares of common stock authorized under stock-based compensation plans	53,720
Maximum
Stock options and stock award Plans
Term of options	10 years
Stock options
Fair value assumptions
Expected stock price volatility (as a percent)	58.00%		56.00%
Expected dividend yield (as a percent)	0.00%	0.00%	0.00%
Risk-free interest rate (as a percent)	1.90%		1.70%
Expected option life	5 years 6 months		5 years 6 months
Shares
Outstanding at the beginning of the period (in shares)	33,890	38,125	41,668
Granted (in shares)	1,000		3,579
Exercised (in shares)	(4,820)	(3,556)	(6,400)
Cancelled (in shares)	(3,195)	(679)	(722)
Outstanding at the end of the period (in shares)	26,875	33,890	38,125
Vested or expected to vest at the end of the period (in shares)	26,587
Exercisable at the end of the period (in shares)	24,436
Weighted Average Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 2.75	$ 2.73	$ 2.09
Granted (in dollars per share)	2.05		8.68
Exercised (in dollars per share)	1.20	1.95	1.78
Cancelled (in dollars per share)	6.33	5.60	4.20
Outstanding at the end of the period (in dollars per share)	2.57	2.75	2.73
Vested or expected to vest at the end of the period (in dollars per share)	2.52
Exercisable at the end of the period (in dollars per share)	$ 2.26
Weighted Average Remaining Contractual Term
Outstanding at the end of the period	3 years 5 months 9 days
Vested or expected to vest at the end of the period	3 years 5 months 1 day
Exercisable at the end of the period	2 years 11 months 23 days
Aggregate Intrinsic Value
Outstanding at the end of the period	$ 11,697
Vested or expected to vest at the end of the period	11,697
Exercisable at the end of the period	11,697
Unrecognized pre-tax compensation costs related to unvested stock options and restricted stock grants
Unrecognized pre tax costs	$ 4,891
Weighted average amortization period	1 year 6 months 18 days
Additional General Disclosures
Weighted average fair value of options granted (in dollars per share)	$ 1.08	$ 0.00	$ 4.45
Cash received from stock option exercises	$ 5,796	$ 6,951	$ 11,376
Income tax benefit from stock options	10	421	11,764
Total intrinsic value of options exercised	$ 3,032	20,475	42,207
Vesting period	4 years
Restricted stock
Unrecognized pre-tax compensation costs related to unvested stock options and restricted stock grants
Unrecognized pre tax costs	$ 31,614
Weighted average amortization period	1 year 11 months 9 days
Additional General Disclosures
Total fair value of awards vested during the period	$ 31,125	$ 13,951	$ 15,104
Shares
Outstanding at the beginning of the period (in shares)	5,823	4,858	7,666
Granted (in shares)	13,856	3,613	2,752
Vested (in shares)	(3,875)	(2,222)	(5,140)
Cancelled (in shares)	(3,594)	(426)	(420)
Outstanding at the end of the period (in shares)	12,210	5,823	4,858
Weighted Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 7.87	$ 7.23	$ 3.84
Granted (in dollars per share)	2.82	7.73	8.60
Vested (in dollars per share)	8.03	6.28	2.94
Cancelled (in dollars per share)	3.70	7.84	6.89
Outstanding at the end of the period (in dollars per share)	$ 3.32	$ 7.87	$ 7.23
Restricted stock \| Maximum
Additional General Disclosures
Vesting period	3 years
Performance based
Stock options and stock award Plans
Stock-based compensation costs	$ 4,122	$ (6,070)	$ 12,634
2000 Plan
Stock options and stock award Plans
Shares of common stock reserved for the granting of stock options and other incentive awards	22,000
2001 Plan
Stock options and stock award Plans
Shares of common stock authorized under stock-based compensation plans	20,000
2004 Omnibus Equity Plan
Stock options and stock award Plans
Shares of common stock authorized under stock-based compensation plans	20,000
2006 Omnibus Equity Plan
Stock options and stock award Plans
Shares of common stock available for grant	50,000
2010 Omnibus Equity Plan
Stock options and stock award Plans
Shares of common stock available for grant	35,000
2012 Omnibus Equity Plan
Stock options and stock award Plans
Shares of common stock available for grant	28,500
2014 Omnibus Equity Plan
Stock options and stock award Plans
Shares of common stock available for grant	58,000
2014 Omnibus Equity Plan \| Stock options \| Maximum
Stock options and stock award Plans
Shares of common stock available for grant	25,000

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Aggregate number of common shares reserved for future issuance.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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